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:: Volume 26, Issue 1 (4-2017) ::
isfj 2017, 26(1): 167-178 Back to browse issues page
The fecundity and population structure of Gammarus Pontogammarus maeoticus (Gurbanova, 1951) in the southern coast of the Caspian Sea
H. Taghavi Jelodar * 1, M. Asgari1 , H. Fazli2 , N. Jafari1
1- University of Mazandaran
2- 2- Ecology Research Center of Caspian Sea, Iranian Fisheries Science Research Institute, Agricultural Research Education & Extension Organization
Abstract:   (5364 Views)

To determine the fecundity and population composition of Gammarus (Pontogammarus maeoticus (Gurianova,1951) ) in coast line of the Caspian Sea, monthly sampling was conducted in ten stationg (between Babolsar to Fereydunkenar) from August 2013 to April 2014.A total of 1906 P.maeoticus speciments, male populationcomposition (673), female (873) and immature (360), respectively. Kruskal-Wallis test based on the average number of Gammarus in stations (χ2 = 14.8; p<0.011) and months (χ2 = 17.6; p<0.040) showed  significant different. The average length of immature, male and female was 4.1, 8.5 and 8.3 mm and weight 0.0068, 0.0303 and 0.0282, respectively. Males have more weight and length than the female and the mean length and weight of the two sexes was statistically significant (length: t-test=2.05; p<0.041 Weight: t-test=2.81; p<0.005, respectively). Gammarus Length and weight equation was very strong based on exponential relationship (p<0.001; R2= 0.80) and slope of line b was 2.1205. The minimum average fecundity was 59/0±0/6 and a maximum of 71/0±4/16. Kruskal-Wallis test between the mean fecundity in different months showed a significant difference (p<0.001).The results show that the overall ratio of male: female was 77/0: 1 which showed completely dominant of females (p<0.001).Also compared the frequency of male and female at different months showed that only in  August and March females are dominant statistically (p<0.05).
 
 
 
 

Keywords: Fecundity, Pontogammarus maeoticus, Beaches, Caspian Sea
Full-Text [PDF 922 kb]   (1642 Downloads)    
Type of Study: Research | Subject: بيولوژي آبزيان
Received: 2016/06/20 | Accepted: 2017/05/14 | Published: 2017/05/14
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Taghavi Jelodar H, Asgari M, Fazli H, Jafari N. The fecundity and population structure of Gammarus Pontogammarus maeoticus (Gurbanova, 1951) in the southern coast of the Caspian Sea. isfj 2017; 26 (1) :167-178
URL: http://isfj.ir/article-1-1585-en.html


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Volume 26, Issue 1 (4-2017) Back to browse issues page

با کسب مجوز از دفتر کمیسیون بررسی نشریات علمی وزارت علوم، تحقیات و فنآوری مجله علمی شیلات بصورت آنلاین می باشد و تعداد محدودی هم به چاپ می رساند. شماره شاپای جدید آن ISSN:2322-5998 است

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